vincentursus asked for my top five bastards. Don't worry, there won't be any more of these this morning- my remaining three questions are taking longer to answer and will probably be concatenated into a single post.
Anyway. Bastards.
John Constantine
Dr. Wallace Breen of Half-Life 2
Saren Arterius of Mass Effect 2 I take it back. Saren wasn't enough of a bastard; his motivations weren't entirely his own. I put forward instead Teyrn Loghain Mac Tir of Dragon Age: Origins. Who did everything entirely under his own motivation and I don't CARE if he thought he was doing it for the love of his country, it all added up to one great big round of WHAT THE HELL IS WRONG WITH YOU.
Justin Hammer as depicted in Iron Man 2 (I haven't read any actual Iron Man comics, so I don't know what he's like there, but I have never in my life encountered another character I uniformly wanted to punch in the face from the instant he first opened his mouth to the instant he was hustled off at the end- and I've read Atlas Shrugged several times)
Sixth Degree Hosteler Tu of Eight Skilled Gentlemen by Barry Hughart